I was doing leg lifts on parallel bars at a calisthenics park. I looked down and I saw that I was performing them at a height of about ten meters from the ground. A group of people were impressed by my leg lifts. The started screaming "go higher, go higher!" and I lifted my legs all the way up until they met my torso, almost in a vertical position. My legs touched a metal ceiling which was rusty and seemed to have a latch on it.